How to get the button to be shown just on certain pages

How to get the button to be shown just on certain pages

Hi,
I have created a new button for external link that refers the URL line on Admin panel.

For this I created a new group and told the the content to refer to this group position.

The button itself work properly, but it shows on each single page like a contact or blueprint pages. 

How can I to make a filter for the button to be shown just on certain pages?